
The Contract Clause, or the law impairing the obligation of contracts, is a part of the US Constitution's Article I, Section 10, which states that No State shall [...] pass any [...] Law impairing the Obligation of Contracts. This clause prohibits states from enacting laws that relieve individuals or corporations of their contractual obligations. It also prevents states from issuing their own currency and grants people the right to form contracts. The Contract Clause was added to the Constitution to prevent states from granting private relief, which was a common practice under the Articles of Confederation, where influential people were relieved of their obligation to pay debts.
| Characteristics | Values |
|---|---|
| Purpose | To prohibit states from enacting laws that relieve particular persons of their contractual obligations, and to protect private rights from state interference |
| Scope | Applies to all types of public and private contracts |
| Exceptions | Does not apply to acts of the federal government, or to contracts offending public policy |
| Judicial interpretation | The Supreme Court has interpreted the clause to limit a state's power to enact legislation that breaches or modifies its own contracts, or regulates contracts between private parties |
| Test for compliance | The regulation must not substantially impair a contractual relationship, the state must have a legitimate purpose, and the law must be reasonable and appropriate |
| Examples of application | In Keystone Bituminous Coal Ass'n v. DeBenedictis, the Court upheld a Pennsylvania safety law against a Contract Clause challenge; in Sturges v. Crowninshield, the Court held that New York's bankruptcy law was invalid as it relieved debtors of pre-existing obligations |
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What You'll Learn

The Contract Clause
- The state regulation must not substantially impair a contractual relationship.
- The state must have a significant and legitimate purpose behind the regulation, such as addressing a broad social or economic issue.
- The law must be reasonable and appropriate for its intended purpose.
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Judicial decisions
The Contract Clause, as outlined in Article I, Section 10 of the US Constitution, states that "No State shall [...] pass any [...] Law impairing the Obligation of Contracts". This clause has been interpreted by the Supreme Court to limit a state's power to enact legislation that breaches or modifies its own contracts, or regulates contracts between private parties.
The Contract Clause has been used to uphold the validity of contracts in the face of state laws that might otherwise nullify them. For example, in Keystone Bituminous Coal Ass'n v. DeBenedictis, the Supreme Court upheld a Pennsylvania safety and environmental law that prohibited mining that would damage existing structures, such as public buildings and homes, against a Contract Clause challenge. The Court found that the law did not nullify the surface owner's contractual waiver of liability for damage to the surface estate from coal mining.
In another case, Exxon Corp. v. Eagerton, the Supreme Court upheld an Alabama law that increased the severance tax on oil and gas extracted from wells located in the state. The law exempted royalty interest owners but forbade producers from passing the tax increase on to purchasers or consumers. The Court found that this law did not impair the obligation of contracts, even though it affected the underlying economics of the contracts.
In United States Trust Co. v. New Jersey, the Supreme Court held that a higher level of scrutiny was needed for situations where laws modified the government's own contractual obligations. The Court has also ruled that the obligation of a contract refers to laws that affect its validity, construction, discharge, and enforcement. This includes the law of the place where the contract was made and where it will be performed.
The Contract Clause has been interpreted to allow the government to create laws barring contracts that offend public policy, such as contracts for sex or child labour. Additionally, the Supreme Court has held that creditors should be paid in gold or silver when a state court seizes the property (bank notes) of a debtor.
In summary, the Contract Clause is a vital tool for upholding the sanctity of contracts and preventing state interference with private economic arrangements. The Supreme Court has interpreted it to cover all types of contracts, including public and private contracts, and has applied it to uphold the validity of contracts in a variety of contexts.
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State law
The U.S. Constitution's Contract Clause prohibits state governments from passing laws that impair the obligation of contracts. This clause seeks to protect private rights from state interference by limiting the states' power to enact legislation that alters existing contract rights. The Supreme Court has interpreted this clause to mean that states cannot pass laws that breach or modify their own contracts or regulate contracts between private parties.
The Contract Clause does not, however, absolutely bar states from modifying their own contractual obligations. An impairment may be constitutional if it is reasonable and necessary to serve an important public purpose. Nevertheless, when the state is a party to the affected contract, courts scrutinize the modification more closely, as the state's self-interest is at stake.
In determining whether a state law violates the Contract Clause, courts apply a three-step analysis. First, they determine whether there is a contractual relationship. Second, they assess whether a change in law has impaired that relationship. Third, they evaluate whether the impairment is substantial. If the impairment is substantial, the court must then determine whether the law has a legitimate and important public purpose and whether the adjustment of the contractual relationship was reasonable and appropriate in light of that purpose.
For example, in the 1978 case Allied Structural Steel Co. v. Spannaus, the Court determined that a Minnesota law regulating private pension contracts violated the Contract Clause. The law imposed a substantial new and retroactive payment obligation on a narrow class of companies, substantially increasing their obligation to fund pensions beyond the terms of their existing contracts. The Court held that the law amounted to a significant impairment that could not be justified for public policy reasons.
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Public vs. private contracts
The US Constitution's Contract Clause states that no state shall "pass any [...] Law impairing the Obligation of Contracts". This clause has been interpreted by the Supreme Court to limit a state's power to enact legislation that either breaches or modifies its contracts or regulates contracts between private parties.
Public and private contracts are fundamentally different in the way they are executed and the scrutiny they receive. Private contracts are typically executed in for-profit organizations, with a focus on driving revenue and increasing shareholder returns. Private procurement allows for more flexibility in budgeting, being able to adapt to changing business conditions. Private sector practitioners are answerable only to management and are held responsible for their actions.
On the other hand, public contracts are executed in the context of not-for-profit organizations, often affiliated with the government. Public procurement budgets are more rigid, with funding limitations, and are expected to address social issues beyond simple value for money. Public sector practitioners are accountable for what they do with public funds.
Political economist Pablo Spiller has differentiated between "third-party opportunism" and "government opportunism" as two basic kinds of conflicts that lock public agencies into rigid and costly contracts. Third-party opportunism involves interested third parties who may benefit politically from exposing hints of corruption in a public agent's actions. Government opportunism involves unilateral changes to the rules of the contractual game when political or economic conditions change. Understanding the risk associated with third-party opportunism is the first step towards improved regulation, efficiency, and reduced costs.
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Federal interference
The Contract Clause, outlined in Article I, Section 10 of the US Constitution, states that "No State shall [...] pass any [...] Law impairing the Obligation of Contracts". The clause is designed to protect private rights from state interference, specifically prohibiting states from enacting legislation that alters existing contract rights.
The Contract Clause does not apply to acts of the federal government. However, it is worth noting that federal interference in contractual agreements has been a concern, with the clause only applying to the states and leaving contracts open to federal interference.
The Contract Clause was pivotal in constitutional law until the early 20th century, serving as a key protection for property rights. It was intended to curb state debtor relief laws that undermined the sanctity of private agreements and threatened credit relationships. The clause assumes a broad scope, covering all types of public and private contracts.
The Supreme Court has interpreted the clause to limit a state's power to enact legislation that breaches or modifies its own contracts or regulates contracts between private parties. The Court has laid out a three-part test for whether a law conforms with the Contract Clause: firstly, the state regulation must not substantially impair a contractual relationship; secondly, the state must have a significant and legitimate purpose behind the regulation; and thirdly, the law must be reasonable and appropriate for its intended purpose.
In summary, while the Contract Clause serves as a safeguard against state interference in contracts, federal interference is not addressed by this clause, leaving contracts vulnerable to federal government intervention.
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Frequently asked questions
A law impairing the obligation of contracts is a law that impairs the validity, construction, discharge, and enforcement of a contract.
The Contract Clause, or Article I, Section 10 of the US Constitution, states that "No State shall [...] pass any [...] Law impairing the Obligation of Contracts". The Contract Clause was added to the Constitution to prevent states from granting "private relief" and to ensure the inviolability of sales and financing contracts.
The Contract Clause allows the government to create laws barring contracts that offend public policy, such as contracts for sex or child labor. It also allows for greater scrutiny when the government modifies a contract to alter its own obligations.











































